During the late 19th and early 20th centuries, urbanization led to the development of new architectural styles in major US cities like Chicago and New York. In Chicago, architects like Jenney, Sullivan, and Burnham pioneered the modern skyscraper and helped establish the Chicago School of Architecture. Their steel-framed buildings featured new uses of space and reflected the diversity and energy of urban life. In New York, while less innovative than Chicago, the architecture emphasized tall skyscrapers that served as logos for major companies headquartered in the city. However, urbanization also brought overcrowded and squalid tenement housing for immigrants in cities.